Boiler-flue.



No. 759,043. 'PATENTED MAY 3, 1904. A. TAGGART, Jn.

BOILER FLUE.

APPLIUATION FIL ED AUG. 26, 1903.

N0 MODEL.

UNiTEn STATES Patented May 3, 1904.

PATENT OEEieE.

BOlLER-FLUE.

.SPECIFIOATION forming part of Letters Patent N 0. 759,043, dated May 3, 1904.

A iicmi fil d August 26, 1903. Serial No. 170,870. (No model.)

To (1M 1071.077]. 27 nutty concern;

Be it known that 1, ANDREW TAGGARI, J r., a citizen of the United States of America, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Boiler- Flues, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in boiler-fines, and has for its object to provide a simple but eflieient connection between the ends of the boiler fines and the flue-sheets, whereby the fines shall be absolutely prevented from leaking at their point of connection with the flue-sheets and at the same time allow the water to reach all the exposed portions of the boiler and the flnes thereof.

A further object of my invention is to construct a fine of this character which may be advantageously employed in connection with different forms of boilerssuch as locomotiveboilers, stationary boilers, marine boilers, or the like and a still further object is to so connect the lines to the flue-sheets as to materially increase the life of the flue.

A still further object of the present invention is to, connect the lines to the flue-sheets in such a manner as to provide an even interior diameter throughout the length of the flue, permitting of the latter being more readily cleaned than in cases where the lines are connected to the flue-sheets by devices inserted in the interior of the lines, at the ends thereof.

A further object of the invention is to construct a-flue which will not become loosened by the exhaust, as is usually the ease in the fines now ordinarily employed.

Further objects are sought to be obtained in the present invention, and these, together with those above noted, will be hereinafter more fully described and specifically pointed out.

In describing the invention in detail reference is had to the accompanying drawings, forming a part ofthis specification, and wherein like numerals of reference indicate like parts throughout the several views, in which Figure 1 is a longitudinal sectional view of a part of a boiler-flue and a flue-sheet, showing the application of a ferrule for securing the flue in position. Fig. 2 is a like view showing the flue secured in position without the ferrule, employing only an inner ring. Fig. 3 is a like view showing the employment of a combustion-ring in the end of the flue.

In the accompanying thawings, 1 indicates a flue formed of a hollow cylindrical tube of the ordinary construction used in steam-boilers. In the different views I have shown different manners of securely fastening the end of this flue in the flue-sheet E2, the principle involved in each of the methods being the same. In each construction the end of the flue 1 is flanged and this flange 3 turned in against the flue-sheet 52, where it may be brazed, as at a in Fig. 3, and in the construction shown in Figs. 1 and 9. the flange may, if desired, be also brazed to the flue-sheet 2. In the construction shown in Fig. 1 the end of the flue is inserted in a ferrule 5, the latter being placed in the opening in the flue-sheet 2, and after being placed in position this ferrule is expanded by means of an expander or other suitable tool, so as to thread the same into the threads 6 in the walls of the opening in the flue-sheet. The inner ring 7 is placed over the inner end of the ferrule 5 and is preferably brazed both to the ferrule and to the inner face of the flue'sheet 2. In Fig. 2 I show the inner ring 7' of angular shape in cross-section, and in this view 1. show this ring as brazed both to the flue 1. and to the inner face of the flue-sheet 2. \Vhen using this form of ring, I may dispense with the ferrule 5 and insert an expander into the end of the flue, whereby to expand the latter into threaded engagement with the threads in the flue-sheet 2. In Fig. 3 I also show a flue expanded into threaded engagement with the opening in the flue-sheet 2, and in this construction I may also braze the ring 7 to the flue-sheet and to the flue. In practice the ferrule and also the inner ring are 'n'eferably constructed of copper, as this material has been found to give the best results. If desired, the flue-sheet may be intcriorly screwthreaded and the ferrule formed with exterior screw-threads for securing the ferrule to the flue-sheet; but generally in practice the threads in the walls of the opcnlng 1n the fluesheet are merely circular grooves, and the ferrule is expanded, so as to force a part of the outer surface of said ferrule into said grooves, whereby to hold the ferrule securely in position. This is also true of the construction in which the flucs are secured direct in the flue-sheet. In Fig. 3 l have also shown the use of a combustion-ring 8, which is of an original diameter to permit of its being brazed within the flue, as shown. The use of this ring has been found to increase the combustion within the flue by reason of the ingress and egress of the flue being lessened, and consequently the provision within the flue of greater space or area for expansion. The employment of this ring also serves to protect the flue materially, as it prevents cinder friction at the ends of the flue, as the cinders striking against this ring instead of coming in direct contact with the flue ends are caused to be projected into the flue for a greater distance before striking the flue, or, as it were, being caused topractically float through the flue. The employment of this fluering therefore dispenses with the use of what are commonly known as safe ends.

It is to be observed that with the construction of boiler-flue herein described for either of the different forms the expansion of the flues and the flue-sheet are equal, owing to the brazing of the flucs to the flue-sheet. It is also to be noted that every flue acts as a stay-bolt for the boiler, being brazed into the flue-sheet, and consequently held intact at all times therewith, making the boiler an absolutely safety-boiler.

\Vhile I have herein shown and described the invention in detail as it has been practiced by me, yet it will be evident that in the practice of the invention various changes may be made in the details of construction without departing from the general spirit of my invention.

Having fully described my invention,what I claim as new, and desire to secure by Letters Patent, is

1. A boiler-flue comprising ahollow cylindrical tube passed through the flue-sheet and having its extending end flanged outwardly and engaged against the flue-sheet, a ferrule in the flue-sheet and through which the flue extends with the said ferrule brazed onto the flue, and an inner ring brazed against the inner face of the flue-sheet and surrounding the flue and ferrule, substantially as described.

2. A boiler-flue comprising a tube having its end flanged outwardly to bear against the flue-sheet, and a ring brazed to the opposite side of said sheet and surrounding said tube.

3. A boiler-flue comprising a tube having its end flanged outwardly to bear against the flue-sheet, a ferrule surrounding said tube, and a ring brazed to the opposite side of said sheet and to said ferrule.

In testimony whereof I affix mysignature in the presence of two witnesses.

ANDREW TAGGARTL, JR.

\Vitnesses:

A. M. WILsoN, A. (IIRARD. 

